1881 Chicago Social Revolutionary Congress
The Congress of Socialists of the United States, better known as the 1881 Chicago Social Revolutionary Congress, was a meeting of anarchists and socialists in Chicago in October 1881 to organize the new social revolutionary groups splintered from the American Socialistic Labor Party. == Preparations == The Chicago congress, officially known as the Congress of Socialists of the United States, was held October 21 to 23, 1881, with 21 delegates in North Side Turner Hall.
Source: Wikipedia — 1881 Chicago Social Revolutionary Congress (CC BY-SA 4.0)